A person lifts a 20 kg box from the ground to a height of 1.0 m. A metabolic measurement shows that in doing this work her body uses 780 J of energy. What is her efficiency?
Added by Kacia G.
Step 1
8 m/s^2, height (h) = 1.0 m Plugging in the values: change in potential energy = 20 kg * 9.8 m/s^2 * 1.0 m = 196 J Show more…
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